$814 Cheap Flights from Seattle (SEA) to Sihanoukville (KOS)

View $814 flight on Fri, May 1, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Sihanoukville (KOS)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Seattle to Sihanoukville (SEA-KOS)

Prices were available within the past 7 days and start at $814 for one-way flights and $1,082 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

EVA Airways
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,082 Roundtrip, found 2 days ago
$1,082
Roundtrip
found 2 days ago
Select EVA Airways flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,082 found 2 days ago
EVA Airways
Fri, May 8 - Thu, May 14
SEA
Seattle
KOS
Sihanoukville
$1,122 Roundtrip, found 5 days ago
$1,122
Roundtrip
found 5 days ago
Select EVA Airways flight, departing Fri, May 8 from Seattle to Sihanoukville, returning Thu, May 14, priced at $1,122 found 5 days ago
EVA Airways
Fri, May 8 - Thu, May 14
SEA
Seattle
KOS
Sihanoukville
$1,162 Roundtrip, found 5 days ago
$1,162
Roundtrip
found 5 days ago
Select EVA Airways flight, departing Fri, May 8 from Seattle to Sihanoukville, returning Thu, May 14, priced at $1,162 found 5 days ago
EVA Airways
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,247 Roundtrip, found 2 days ago
$1,247
Roundtrip
found 2 days ago
Select EVA Airways flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,247 found 2 days ago
Turkish Airlines
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,590 Roundtrip, found 2 days ago
$1,590
Roundtrip
found 2 days ago
Select Turkish Airlines flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,590 found 2 days ago
Turkish Airlines
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,688 Roundtrip, found 2 days ago
$1,688
Roundtrip
found 2 days ago
Select Turkish Airlines flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,688 found 2 days ago
Qatar Airways
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,842 Roundtrip, found 2 days ago
$1,842
Roundtrip
found 2 days ago
Select Qatar Airways flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,842 found 2 days ago
Qatar Airways
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,844 Roundtrip, found 2 days ago
$1,844
Roundtrip
found 2 days ago
Select Qatar Airways flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,844 found 2 days ago
Qatar Airways
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,989 Roundtrip, found 2 days ago
$1,989
Roundtrip
found 2 days ago
Select Qatar Airways flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,989 found 2 days ago
Qatar Airways
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$1,991 Roundtrip, found 2 days ago
$1,991
Roundtrip
found 2 days ago
Select Qatar Airways flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $1,991 found 2 days ago
Emirates
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$2,102 Roundtrip, found 2 days ago
$2,102
Roundtrip
found 2 days ago
Select Emirates flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $2,102 found 2 days ago
Turkish Airlines
Mon, May 4 - Mon, May 18
SEA
Seattle
KOS
Sihanoukville
$2,338 Roundtrip, found 2 days ago
$2,338
Roundtrip
found 2 days ago
Select Turkish Airlines flight, departing Mon, May 4 from Seattle to Sihanoukville, returning Mon, May 18, priced at $2,338 found 2 days ago

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS) cost?
Grab a cheap one-way flight from $814 or cheap return flight from $1,082 from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS)?
The cheapest month to fly from SEA to KOS is May, when there's less demand. Off-peak season is generally when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS)?
To find the cheapest airline that'll fly you from SEA to KOS, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS)?
There aren't any daily nonstop flights departing from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from SEA to KOS?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS)?
To avoid possible delays on the Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS) route, aim to fly before 3 PM. Later departures have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS) last-minute?
Waiting until just before your departure to book your flight from SEA to KOS generally means paying more. While it's possible to find some last-minute discounts, there's no guarantee. Be flexible with your itinerary to maximize your chances of scoring a bargain.
Is it cheaper to book a SEA to KOS flight and hotel package?
You'll typically save money by booking a SEA to KOS flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. After selecting your ideal accommodations and flights, consider adding extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Sihanoukville Airport (KOS)?
You can usually cancel or reschedule your SEA to KOS flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Sihanoukville
Roundtrip price
$1,082
Distance
7536 mi

Book with confidence

Book with confidence

Seattle to Sihanoukville Flights

The cheapest times to fly from Seattle to Sihanoukville

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Sihanoukville are during the month of May. You can find some of the cheapest flights from Seattle to Sihanoukville with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Sihanoukville

Sunday is one of the best days to book for cheap flights from Seattle to Sihanoukville: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Sihanoukville

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Sihanoukville in 2025. You can also book with separate airlines for your outbound and return journeys, from $814 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Sihanoukville flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Sihanoukville airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Seattle to Sihanoukville Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.